Looking at that image, it looks like the OCS/ECS chips are to be transplanted from an existing A500/500+. That's not quite so easy to do on your AGA A1200 where the custom chips are all SMD.
iv done it here on one of my motherboards,most of my A1200 chips have sockets including the very small 20 pin chip to the bottom left on the motherboard.
FREESCALE MC68EC020AA25 ( 25Mhz ) fitted to motherboard awaiting to find if there`s a possible hack.
